This revision follows recent adverse port state control actions against U.S. flagged vessels that revealed several cases of U.S.-documented vessels calling on U.S. ports with non-U.S. credentialed personnel instead of U.S. citizens. The intent of this MSIB is to provide information and guidance to vessel owners and operators regarding the provisions for employment of non-U.S. credentialed personnel on board certain U.S. documented vessels, and, the potential negative implications of non-compliance.
Source: USCG
Link: 11/1/2018: MSIB 009-12 (Rev 1) Employment of non-credentialed personnel onboard certain U.S. documented vessels